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In the tree view, click Piping > Piping Specification > Piping Materials Classes.
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In the Piping Materials Classes branch, open a specification and click Piping Materials Class Rules > Permissible Nominal Piping Diameters Rule.
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Click the Insert Row Command to insert a blank row in the grid view.
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In the Nominal Diameter column, type the nominal piping diameters that you want to define in your piping materials class.
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In the Unit Type column, type the units for your NPD. For example, type mm or in.
The Pipe Nominal Diameters sheet in the Piping Materials Class.xls workbook corresponds to the Permissible Nominal Piping Diameters Rule node. See Piping Reference Data.